Few dog owners I meet know that there is a first fear period. Even fewer know about a second one.

It’s easier to pinpoint the first ‘Fear Imprint Period’ – some say between eight and thirteen weeks, others as small a gap as between 8 and 10 weeks.

The Second Fear Imprint Period or Fear of New Situations Period (also called Secondary Fear Phase) can be anywhere between six and eighteen months.

That’s not very helpful, is it.

How can people know when to be extra careful as their dog approaches a second fear period? How long will it last? Is it the same duration with big dogs and little dogs, working dogs, companion dogs and so on? I can’t find any real research on the subject.

As the second fear period seems to be associated with the dog’s maturing sexually, it will mean that in large breeds the fear period may develop later than with a smaller dog.

It’s important to accept that if a dog becomes suddenly fearful a fear period is worth considering but it may be to do with something else altogether. It goes without saying that any sudden change in behaviour warrants a trip to the vet to make sure there is nothing physically wrong.

PetHelpful.com explains, …’During these distinct periods dogs may gradually become more and more fearful of situations they once appeared to be accepting of. The fear may be manifested by overly cautious behaviors, where the puppy or dog approaches people or items tentatively or defensive behaviors involving barking/lunging/growling. In some cases, dogs may act bold towards certain stimuli and uncertain with others…’

According to Meghan E. Herron, veterinarian and Diplomate of the American College of Veterinary Behaviorists, ‘…fear period is therefore a stage during which the puppy or dog may be more apt to perceive certain stimuli threatening. During this time, the puppy is very sensitive to traumatic experiences and a single scary event may be enough to traumatize the puppy and have life-long effects on his future behaviors.’

This is what I believe had happened with a dog I went tothe other day and why I have been trying to find out more about it.

Herron continues, ‘It is a survival mechanism because, as explained by Patricia McConnell in her book ‘For the Love of a Dog’, lack of caution now they are fully mobile may cause them to easily get killed’ This also, unfortunately, also coincides with the time most puppies are separated from their litter mates and go to new homes.

Dogs may suddenly start to appear fearful of new things that they would have coped with easily previously including inanimate objects.It can result inbarking and lunging and pulling on the leash so this fear period has a big impact, causing the owner to worry about the dog’s behavior.

Clarence Pfaffenberger, author of The New Knowledge Of Dog Behavior, suggests there is a third fear period taking place in early adulthood. During this time, the level of aggression may increase and the dog may appear more protective and territorial. Some believe there may even be a fourth period as the dog reaches early adulthood.

Nancy Frensley, behavior and training manager at the Berkeley East Bay Humane Society in California, gives four possible fear periods. ‘Fear periods in puppies generally occur during these ages: 7 to 9 weeks; 4 to 6 months; at about 1 year; 14 to 18 months’.

Gail T Fisher calls the second fear period ‘Fear of New Situations’ (FNS), when the dog is reluctant to approach something familiar, as if seeing it for the first time. She says it occurs between 6 and 18 months of age and may occur more than once. Her theory is that FNS is related to adolescent growth spurts.

‘During these periods, puppies may show fear of items, situations or people with whom they formerly felt safe,’ says Frensley. Submissive urination, crouching, shaking and other related behaviors might be evident.

Laura McAuliffe of www.dogcommunication.co.uk explains the second fear period nicely. Suddenly spooked. The Secondary Fear Phase. ‘Your teenage puppy may suddenly show fear, backing away or perhaps even barking at things they coped well with before- people with hats, flapping carrier bags, people on ladders, bikes and scooters, black or flat faced dogs etc are all top ten triggers.’ Inanimate objects can suddenly become a source of terror!

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About Theo Stewart

I am a dog Behaviourist (INTODogs - ICAN Companion Animal Behaviourist) and trainer covering Beds, Herts, Cambs and Bucks, a 'Victoria Stilwell' Positively Dog Trainer (VSPDT) and a full member of the IMDT. Graduate ISCP, International School for Canine Practitioners. My main site: www.dogidog.co.uk

This is the most useful piece I have come across on this topic. I have a confident bouncy 7 month old puppy and have been wondering whether she may be in such a period due to one or two “scaredy-cat reactions” lately as well as some reactivity following a very thorough socialisation it to 16 weeks and beyond. It’s very reassuring to read this as it helps both to put her behaviour into a context and alert me to the need to just be aware/cautious of the possibility. Thank you very much.

My 5 1/2 month old puppy is suddenly afraid of new situations, people and noises, such as traffic and trucks. We were thinking it may be a fear period, but it has now lasted for about a month- 5 weeks.
Any thoughts?!

I’ve found that the second fear period coincides with the loss of puppy teeth. At that time the puppy no longer has puppy breath that tells adult dogs ‘I am a baby don’t hurt me.’ and their loss of teeth make their defense against scary things more difficult. All they can really do is run and hide, thus run and hide because a proven strategy to get away from scary things.

Laura-Anne of Canis Bonus describes it thus: The second fear period (6 to 14-18 months): This is not so much one continuous period as a series of short periods popping up once in a while. This is when you might start seeing territoriality rear its ugly head (stranger = very much danger in the dog’s mind, particularly on his home turf).https://www.canisbonus.com/2018/06/08/newsflash-dogs-have-two-fear-periods/